Plastic hinge length is the crucial parameter in predicting the nonlinear response of structural elements. Due to the complexity of material nonlinearity, the accurate estimation of the plastic hinge length has been facing many difficulties. In past decades, some definitions and models were proposed for predicting this length, however, the results had a large discrepancy. Therefore, the paper presents a general approach of plastic hinge length that based on some criteria, i.e., strain profiles of rebar, peak strain of concrete cover and core, curvature profiles, and physical observation. In addition, a series of four full-scale reinforced concrete columns were implemented and tested under high axial load ratio and different transverse reinforcement details. The tested results implied that it is necessary to separate the plastic hinge lengths based on different criteria due to the large discrepancy. The high compression load could enhance the plastic hinge lengths based on compressive yield strain of rebar, peak strain of concrete, and curvature profiles. In contrast, it had a minor effect on plastic hinge length based on tensile yield strain. Besides, the amount of transverse reinforcement had an insignificant effect on plastic hinge lengths. Finally, some discussions on plastic hinge lengths of tested columns were established in this study.
Keywords: plastic hinge, plastic hinge length, plastic hinge region, reinforced concrete column, concrete structure.
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